Interlocking door for waste chutes



May 25 1926.

1,586,505 G. D. BEAVER INTERLOCKING DOOR FOR WASTE CHUTES Filed July 22,1924. a Sheets-Sheet 1 1; 44 5== I E M 51%.

May 25 1926.

G. D. BEAVER II INTERLOCKING DOOR FOR WASTE CHUTES Filed July 22, 1924 2Sheets-Sheet 2 GAIL D. BEAVER, orErnILAnEnr Il ;,snnnsynvanm; assre vonrrofnAsLn r'r (more AND" CONVEYOR; COMPANY, on'onxs PEKNSYLVANIA,1Aconronnmon or; 31mm 1 .SYLVA'NIA;

m 'rnnnoonrno noon ronWAsTn'on-u'rnsff xpplicatiqnfiledfiluly 22; 1924.s r al no. 727,415.

. My invention relates :to theiprotective closure of passage ways bydouble doors andto means for opening and. closing the double doors; Itfindsits best illustration in protection of branches of waste chutesfrom building and inlet branches areprovided at the difierenti floors toreceive'svveepings and Waste ment. I

To avoid? risk. of-Qfirespreading from floor tofloor. through;v the:chute "it is desirabl'e to: have.- the; chute everywhere: at. all

times sealed-z from-the interior-of the build:

i'ng, andtheamain puifpose of my. inventionzis to provide improved,inexpensive and .efii" cient means for" absolutely: sealing, the chuteat all ti1nes fron1 the; iht'e'rioivof the build- 1n'g.j. V Airlurtherpurpose is to provide improved interlocking operating imeclianism: fordoors so relatedfto" th'emxthatgit will operate. either door-rseparately andwhen the one door is being. operated will lock the otherdoorshut.

* The operating; mechanism may. he looked "at its intermediate positionso as to lock bothr doors or'may be arranged to lock both doors by itsposition alone;

. A 'further purpose: is to'have the dOOrSD pivoted. and: simultaneouslypositioned. by

means of pivoted. operatingmechanism that simultaneously mates with and:positions or separately. and successively. operates other;

rotary mechanism. connected with: the individual doors.

media-l2 position and: may look them-shut,

of this mechanism: (Figure 7 'By movement oflthe operatingqmechanism'in; on direction l lock. (e1; continue to maiir matter for delivery tothe base left freetomove in "this; way, as preferred. a

I thus hold. both doors shut where theoperatingj niechanism'isin theeither bylocki'ng the operating mechanism (Figure 3:): on by theposition: of the-parts Chutes already existz with il iterlocliing fsureselosure of one doe. when theotheriq I I double--.'doors in whichthe interlookingem Y aste chutes usually extend-vertically the basement.to the: top of" a full-yopen yet does not ensure closure at othertimes,v permitting.both doors to be.

partially open atfthe same time; 'lhiszcon- 'dition defeats;- ina'measure,the purpose for-.Wliichfthe doors are installedflVvith' myinterlocking: doors, common means ISHPBO- videdr foropera-tinglboth,doors; one at time and nBlhhGB dQODGan move atalllunle'ss the; other-i door is entirely I closed. 1 Neither dooiiicanoperate the other. Looking means may he I {provided for" the: individualdoors to prevent themfromgmoving in response to pressureupon'ethedoorsyor theyflmay be I either door. but not both) I type. withvariations-in the lockingg means Ihaire preferred to illustratebutonelmain proved to berpractioa-l, effective, inexpensive and thoroughly"reliable and .WhichQat the same flti-meivell illustrates the principles0% my. inventionli Figure 1* shows a broken'-side elevation i1.-lustrating my invention. i

, li ijgmre2l is aaplanxof Figure 1.;

; Figure 3 isa front-elevation of Figure 1.

Figure .4; is an enlarged detail illustrating .theaoperating; gears whenibotlr doors are closed. M,

Figure 5 is a view similar to Figure 4L hutwith totheouterdoorheingopenivide; p

' Figure GgisR-a similar View 'showingi'the gears. in position.corresponding to that in which: the outer oor iscl'o'sedand. the innerthe gearsinp'osition corresponding 1 door is open Wide.

' Fi ure-71" operating gears n which" the operating gear locks bothdriven gears 1n closed positrons'of v the doors :closed by them.

p provided for theoperating mechanisms and inthe chutes, {selecting aform WhlCh has...

1s an Jenla'rgedI detail showing Figures 8 and 9 are fragmentarysections of the chute showing forms slightly variant from that ofFigures 1-3.

In the drawings like numbers refer to like parts.

Describing the invention in illustration and not in limitation andreferring to the drawings The main chute 15 runs from the basement tothe roof, a small section thereof, that at a single floor, being shownin the figures. A requisite condition for fire protection is that thereshall never be direct connection between the chute and the interior ofthe building. i

Each lateral chute or inlet 16, giving access to the chute at a floor,is supplied with double doors 17 and 18. One only of these should becapable of opening movement while the other is kept tightly closed.Assuming that the outer door 18 is open, sweep-- ings and waste matter,laundry or other material for delivery to the basement is passed throughthe opening but cannot pass from the lateral chute into the main chutebecause the inner door 17 is closed tight, preventing direct openingbetween the main chute and the room into which the door 18 opens. 7

So far as I am aware I am the first to provide efficient common meansfor positioning, operating and controlling both doors in a way to whollyavoid this danger of direct opening between the chute and room.

The outer door 18 is connected with a hinge, shaft or pintle 19 (seeFigures 7, 8

and 9) which rigidly carries the gear 20 and the inner door 17 isconnected with a similar hinge, shaft or pintle 21 rigidly carrying thegear 22 so that the positions of the doors are controlled, respectively,by these gears.

The intermediate gear 23 is mounted upon a shaft or pin '24 upon whichit may turn or which may turn it as preferred. The hand lever 25 mayevidently be connected with the shaft, where the shaft drives the gearor directly with the gear. The gear is so constructed and connected asto operate both doors, one at a time. The hand lever 25 is provided withcatch 26 at the position which corresponds to the outer door open andinner door closed, the purpose of this catch being to hold the outerdoor open when matter is being dumped into the chute.

The driving or intermediate gear 23 has teeth 27 cut on a portion onlyof its outer circumference, the remaining portion 28 of thecircumference being circular and having a. radius correspondingapproximately to that of the pitch circle of the teeth.

The gear 20, which positions the outer door. has full sized teeth 29fora portion of the circumference and has two or more teeth 30 and30,'at one end of the toothed portion used, cut away to give a concavesurface or separated contact edges with a hollow between to fit theconvex circular are portion 28 of the gear 23. As the surface at 3 shownas a recess between the two teeth is not used, the concavity not needingto be as deep as this, it is immaterial whether it be left out a recess,as would be the case in the normal cutting of the gear, or be filled into the pitch line. Likewise it is immaterial as to the contour of thesurface 31, which is shown a circle. It could be filled with teeth orflattened or have other different contours as it is not used.

In the same way the upper gear 22 operating the inner door 17 has teeth32 full size around a portion of its circumference and two or more teeth33, 33 cut to cooperate with the convex are 28 of the intermediatewheel.

For the same reasons explained in connection with gear 20, it isimmaterial from a mechanical standpoint whether the surface recessed at34 be av recess inside its pit-ch circle or not and the surface at 34may be of any contour.

The important thing is to give the driven gears and driving gearcontours adjacent to their full toothed surfaces such that the drivinggear shall act as a stop for the driven gears, permissible for both inthe neutral po sition of the driving gear (Fignre7), but in any eventfor each one of them just'the moment the other has moved to beginopening of its door. Thisinterfitting stop connection is illustrated. byone form of the so-called Geneva stop mechanism or motion.

It will be evident that the sizes and proportions of the gears as wellas the extents of openings of the doors will determine whether or notany of the teeth upon gear 23 which engage the teeth of gear 20(beginning with the left end of the line of teeth in Figure 5) will alsocome into mesh with the teeth of gear 22 (with which the teeth of gear23 begin to mesh from the right end of the line of teeth) or whether thetwo sets of engaging teeth upon gear 23 will overlap, as would be thecase with a smaller diameter of gear 23 or with a larger throw of thedoors. In the illustration shown they do not overlap and one of theteeth shown may not engage with the teeth of either of the gears 20 or22, depending upon the extent of opening given to the inner door. Forthis reason the arc of teeth upon gear 23 may be interpreted to form twoarcs. Where there is a gap between the teeth from the to ends engagingthe two gears they may even form two arcs or sets of teeth and the teethshown on gear 23, evenwhen uninterrupted may be viewed as forming twosets.

For much the same reason, the range of.

may be wrapped about the pintle and one end of which will press againstthe door to tend to hold it closed.

In Figure 9 the door 17 is tangent to the inside of the pintle uponwhich it is carried instead of being tangent to the outside of thispintle as in Figure l with the result that the door tends to closebeyond the position shown in Figure 9 causing reliable closure against asurrounding flange 39.

. I recognize that this operating mechanism is suited to uses forprotecting other passages than chute passages and have therefore usedthe chute form as an illustration upon which claims of broader scope arefounded.

A great advantage of my invention is its practically fool-proofcharacter in that 'the doors cannot both be opened at one time even inthe case of carelessness by the users. The interior of the main chutecannot at any time come into direct communication with the room..

It will be obvious that those skilled in the art will see modificationsvand changes which may be made in my invention without departing from thespirit and scope and it is my purpose to claim all such herein as comewithin the reasonable spirit and scope of my invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is z- T 1. A chute, a pair of swinging spaceddoors for the chute each having. a tendency to close, driven gearsrespectively connected to turn when the doors turn, an intermediatedriving gear between the driven gears adapted to drive the driven gearsto open either door and, when free, to be driven by the closingtendency-of either door to permit closing of the dOOr automatically andstop devices between the driven gears and the driving gear preventingopening of either door when the other is not closed.

2. A chute, a pair of swinging spaced doors for the chute respectivelypressed toward closed-position and each having closing movement in adirection opposite to that of the other, driven gears respectivelyturning when the doors turn, an intermediate driving gear between thedriven gears adapted to drive the driven gears to open either dooraccording to its direction of turning and. when free, to be driven bythe closing tendency of either door to permit closing of the doorauton'iatically, means for turning the driving gear and stop devicesbetween the driven gears and the driving gear preventing opening ofeither door when the other is not closed.

3. A chute, a pair of pivoted doors therein, a gear upon each door pivotturning with the door, an intermediate gear between the two gears andstop interlocking between the intermediate gear and first gears wherebythe position of the intermediate gear corresponding to open or partlyopen position of either door stops the gear upon thepivot of the otherdoor from turning.

4. A chute, a pair of pivoted doors therein, a gear upon each door pivotturning wi h the door, intern'iediate gearing mechanism be tween the twogears and stop interlocking between the intermediate gearing mechanismand first gears whereby the position of the intermediate gearingmechanism corresponding to open or partly open position of either doorstops the gear upon the pivot of the other door.

5. A chute, oppositely swinging doors therefor, and driving and drivengearing controlling the position of said doors each having gear teethand cooperating stop motion surfaces, characterized by engagement of theSLOP surfaces of the driving gearing and the driven gearing for eitherdoor to hold that door closed and at the sametime by engagement of theteeth of the driving gearing and of the driven gearing for the otherdoor to open said other door.

6. In a chute, a pair of doors swinging in opposite directions to closethe chute, two gears connected one with each door to swing with thedoors, and each having teeth and an adjoining stop motion element and intermediate mechanism having teeth for engagement by the teeth of eithergear and adjoining the teeth adapted to cooperate with the-stop motionelements of the two gears, one at a time, whereby opening of either doorturns the intermediate mechanism and applies the stop motion to thegears connected with the other door.

7. The combination of a chute, pivoted doors threin having parallelshafts, and means comprising gearing on the two shafts and gearingcooperating therewith for opening either door whileholding the otherdoor closed. r

8. A pair of doors and driving mechanism for opening either door whileholding the other closed, comprising a driving gear having teeththroughout an arc of its circumference and, at each end of the arc, aconvex smooth surface, in combination with driven gears on oppositesides of the driving gear, connected with the doors, having teeth whichcooperate with teeth upon the driving gear and spaced contact surfacesadjacent the teeth cooperating with the convex surfaces respectively ofthe driving gear to free the driven gears from driving engagement withthe driving gear and lock them against movement.

9. The combination of a. chute, a branch chute thereto, inner and outerpivoted doors in the branch, a gear for successively positioning thedoors by its angular position and having both operating and lockingparts and connections between the gear and doors int) 20. A passage way,spaced pivoted doors therein and a combined driving and stop mechanismfor opening either door while holding the other closed and comprising. adriving gear having two setsof teeth and adjacent each set for a portionof its circumference, a convex locking surface, and

a pair of driven gears respectively connected operatively to the doorsand each having teeth meshing respectively with the two sets upon thedriving gear and aconcaved locking surface adjacent the teeth adaptedto" engage respectively with convexed locking surfaces of the drivinggear and arranged so that the toothed engagement between the lockingboth drivengears.

i oAiL D. BEAVER.

